The LM3560 is a 2-MHz fixed frequency synchronous boost converter with two 1000-mA
constant current drivers for high-current white LEDs. The dual high-side current sources allow for
grounded cathode LED operation and can be tied together for providing flash currents at up to 2 A
through a single LED. An adaptive regulation method ensures the current for each LED remains in
regulation and maximizes efficiency.
The LM3560 is controlled via an I2C-compatible interface.
Features include an internal 4-bit ADC to monitor the LED voltage, independent LED current control,
a hardware flash enable allowing a logic input to trigger the flash pulse, dual TX inputs which
force the flash pulse into a low-current torch mode allowing for synchronization to RF power
amplifier events or other high-current conditions, and an integrated comparator designed to monitor
an NTC thermistor and provide an interrupt to the LED current. Additionally, an active high HWEN
input provides a hardware shutdown during system software failures.
The device is available in an ultra-small 16-pin DSBGA package. The 2-MHz switching
frequency, overvoltage protection and adjustable current limit allow for the use of tiny,
low-profile (1-µH and 2.2-µH) inductors and ceramic (10-µF) capacitors.
For all available packages, see the orderable addendum at the
end of the data sheet.
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